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  • 1
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    Olivine-garnet reaction in peridotites from Tanzania. (1972)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Missing abstr.
    Keywords: GEOPHYSICS
    Type: Lithos; 5; 1972
    Format: text
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  • 2
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    Simulation of the current-driven electrostatic ion cyclotron instability (1981)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: Results are presented of a self-consistent particle simulation of the growth and saturation of electrostatic ion cyclotron (EIC) waves along auroral field lines. The driving mechanism for the waves is an initial drifting Maxwellian distribution for the electrons. The magnetic field is taken to lie in the simulation plane, so that modes such as the ion acoustic instability and the EIC instability can be excited, thus making it possible to study the behavior of EIC waves in the presence of ion acoustic turbulence. A dc electric field, which tends to keep the current constant along the field lines, is included. It is shown that the EIC instability grows to a moderate level before saturating due to plateau formation. The perpendicular ion temperature increases by typically 40%, with an increase arising from bulk heating only. The anomalous resistivity, associated with the EIC instability is determined and compared with previous calculations and with that due to the ion acoustic instability. Implications of the results for observation of ion cyclotron waves on auroral field lines are discussed.
    Keywords: GEOPHYSICS
    Type: Geophysical Research Letters; 8; June 198
    Format: text
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  • 3
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    Global magnetohydrodynamic simulation of the two-dimensional magnetosphere (1979)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: The time-dependent magnetohydrodynamic interaction of the solar wind with a two-dimensional dipole magnetic field has been simulated using a novel Lagrangian particle type of MHD code that can treat local low density or vacuum regions without numerical instability. This enables one to simulate the time-dependent magnetic tail. When the solar wind field is southward, a magnetic field line topology consistent with Dungey's model emerges in steady state. The tail, however, is short, and the x-points are only slightly shifted from their vacuum locations, because of strong numerical resistivity. Different configurations resulting from different relative orientations of the solar wind magnetic field and dipole axis are also presented. While the magnetic field is relatively steady, the density and flow in the magnetosheath are turbulent, as are the bow shock and magnetopause; the Kelvin-Helmholtz instability may account for these phenomena. We also model a 'substorm' as the passage of a rotational discontinuity in the solar wind over the dipole. Both 90 and 180 deg shifts to a southward solar wind field cause a violent readjustment of the magnetic tail which eventually settles down to the Dungey configuration.
    Keywords: GEOPHYSICS
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  • 4
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    Global simulations of the three-dimensional magnetosphere (1981)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: Global three-dimensional computer simulations of the magnetosphere using a particle MHD code, reproduce the steady-state Dungey magnetospheric topology in three dimensions. The formation of a compression zone downstream of the tail neutral line that is probably bounded by wake shocks is observed. This compression zone changes its cross-section with distance downstream.
    Keywords: GEOPHYSICS
    Type: Geophysical Research Letters; 8; Mar. 198
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  • 5
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    Global simulation of the time-dependent magnetosphere (1978)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: The paper presents preliminary results from time-dependent two-dimensional numerical modelling of the magnetohydrodynamic interaction of the solar wind with the magnetosphere. A southward solar wind-field produces a magnetospheric topology consistent with Dungey's (1961) model. The interaction appears to be fundamentally unsteady; the shock, magnetosheath, and magnetopause are highly turbulent. A 'substorm' is modelled as the passage of a rotational discontinuity over the magnetosphere; the onset of enhanced reconnection in the magnetospheric tail produces a closed magnetic island which convects downstream.
    Keywords: GEOPHYSICS
    Type: Geophysical Research Letters; 5; July 197
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  • 6
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    A three dimensional MHD model of the earth's magnetosphere (1981)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: The results of a global MHD calculation of the steady state solar wind interaction with a dipole magnetic field are presented. The computer code used, being much faster than previous codes, makes it possible to increase the number of grid points in the system by an order of magnitude. The resulting model qualitatively reproduces many of the observed features of the quiet time magnetosphere including the bow shock, magnetopause, and plasma sheet.
    Keywords: GEOPHYSICS
    Type: Geophysical Research Letters; 8; May 1981
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  • 7
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    A simulation study of cold electron heating by loss cone instabilities (1980)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: Results are presented of a computer simulation study of electron cyclotron harmonic waves; an electrostatic finite size particle simulation code is used. The initial electron velocity distribution function is modeled as a hot ring perpendicular to the ambient magnetic field and a cold Maxwellian component. Nonlinear cyclotron resonance is found to be the saturation mechanism of the unstable waves and the heating mechanism of the cold electrons. The results can be related to certain ionospheric phenomena.
    Keywords: GEOPHYSICS
    Type: Geophysical Research Letters; 7; Nov. 198
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  • 8
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    An MHD simulation of the effects of the interplanetary magnetic field By component on the interaction of the solar wind with the earth's magnetosphere during southward interplanetary magnetic field (1986)
    In:  Other Sources
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    Publication Date: 2019-07-12
    Description: The interaction between the solar wind and the earth's magnetosphere has been studied by using a time-dependent three-dimensional MHD model in which the IMF pointed in several directions between dawnward and southward. When the IMF is dawnward, the dayside cusp and the tail lobes shift toward the morningside in the northern magnetosphere. The plasma sheet rotates toward the north on the dawnside of the tail and toward the south on the duskside. For an increasing southward IMF component, the plasma sheet becomes thinner and subsequently wavy because of patchy or localized tail reconnection. At the same time, the tail field-aligned currents have a filamentary layered structure. When projected onto the northern polar cap, the filamentary field-aligned currents are located in the same area as the region 1 currents, with a pattern similar to that associated with auroral surges. Magnetic reconnection also occurs on the dayside magnetopause for southward IMF.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 91; 10029-10
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  • 9
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    An MHD simulation of By-dependent magnetospheric convection and field-aligned currents during northward IMF (1985)
    In:  Other Sources
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    Publication Date: 2019-07-12
    Description: A three-dimensional MHD simulation code is used to model the magnetospheric configuration when the IMF has both a northward B(z) component and a B(y) component in the east-west direction. Projections of the plasma pressure, the field-aligned velocity, the field-aligned vorticity, and the field-aligned current along the magnetic field lines into the northern ionosphere are shown and discussed. Cross-sectional patterns of these parameters are shown. The results demonstrate that the B(y) component of the IMF strongly influences the plasma sheet configuration and the magnetospheric convection pattern.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 90; 10
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